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Gamma vs Slidely AI

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. Gamma starts at $8, Slidely AI at $20. Both have a free tier. Both ship a public API.

GammaPrompts become decks, docs and sites you can publishSlidely AIY Combinator-backed tool that turns prompts, data, or sketches into editable PowerPoint decks.

Side by side

FactGammaSlidely AI
CategoryPresentation & Slide GeneratorsPresentation & Slide Generators
Pricing modelFreemiumFreemium
Starts at$8 month$20 month
Public APIYesYes
PlatformsWeb, APIWeb, Windows, macOS, API
CompanyGammaTersho Inc.
Launched2020—
Last verifiedSep 6, 2026Sep 1, 2026

What our research says

Gamma

The tool that genuinely displaced PowerPoint for a lot of people, and it is profitable enough not to need your money — but credits, not seats, decide how much a plan is actually worth.

Pros

  • Layout and image choice happen without picking a template first
  • One document publishes as a deck, a doc or a live web page
  • Plus at $8/user/month already removes the Gamma badge
  • Profitable at over $100M ARR, so the vendor is not a runway risk

Cons

  • Credit accounting is opaque — a premium image can cost up to 125 credits
  • API keys are locked to Pro and above
  • The free plan's 400 signup credits do not go far on image-rich decks
  • Export fidelity to PowerPoint degrades on complex layouts

Slidely AI

Slidely's PowerPoint add-in and Excel-linked charts make it more useful for people who live inside Microsoft Office than a browser-only deck tool would be. The free plan is deliberately limited, with add-in access cutting off after 15 days, so it functions mainly as a trial rather than a lasting free tier. Enterprise-oriented compliance claims, including SOC 2 and GDPR, suggest it is aimed at business buyers as much as individuals.

Pros

  • PowerPoint add-in works natively inside Windows and Mac Office, not just the browser
  • Excel-linked charts and tables update automatically instead of needing re-export
  • Y Combinator backing and named compliance certifications add some outside verification

Cons

  • Free plan's PowerPoint add-in access expires after 15 days
  • Entry paid tier still requires a per-seat jump to Team pricing for collaboration

Which one fits

Choose Gamma if you need

  • Anyone who needs a presentable deck out of rough notes in minutes
  • Teams publishing one-page sites and documents without a website tool
  • Users who want AI layout but expect to keep editing afterwards

Choose Slidely AI if you need

  • Teams that need decks to stay editable inside PowerPoint, not just exported once
  • Users who want charts and tables linked live to an Excel file
  • Companies that need SOC 2 or GDPR compliance documentation

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